Bosch EVX-BA User Manual

EVX-BA

The EVX-BA provides a means to switch in a backup amplifier in the event of a primary amp failure. One backup amp can be provided in reserve for several primary amps. Amplifier outputs are connected at TB2, and speaker field wiring at TB1. Supervisory and 24 VDC power inputs are provided at TS1. The LED on-board activates when the backup amp has been switched in. All wiring is power-limited. Mounts to snaptrack or 5/8” nylon standoffs.

The EVX-BA is compatible with both 25VRMS and 70VRMS audio signals.

INSTALLATION:

Mounting: The EVX-BA is mounted in the same cabinet that houses the primary amplifier. It is designed to be mounted into standard 3” snap track material. The board also has mounting holes at the corners for stand-off mounts where necessary. 5/8” nylon standoffs are required.

TS1:

Ter. 1 - Ckt. Neg

Ter. 2 - +24 VDC

Ter. 3 - Gen Input

Ter. 4 - +24 VDC

TB1:

Ter. 1 & 2 - Audio Output

TB2:

Ter. 1& 2 - Audio Input from backup amplifier

Ter. 3&4 - Audio Input from primary amplifier

JUMPERS:

J1: jumps TS1-2 to TS1-4

Fig. 1 - Board

SPECIFICATIONS:

TS1

Power: 24 VDC

Current: 40 mA Standby

10 mA Active

4	3	2	1
LED
J1			1 +
1			2 -
2			3 +
TB1			4 -

TB2

BA-100 Rev C

P/N 1-5030 REV. B

LED activates when backup audio is switched in

Install jumper J1 to eliminate

TS1 2 - 4 connection

+

-

Speaker Output

Fig. 2 - Typical Connection Detail

	FROM PRIMARY AMP				NOTE:
					If primary amplifier is an
	TB-2 TB-3 TB-2
					EVX-25, EVX-50, or EVX-100
	#10	#7		#1	place dipswitch #5 on SN-2
					of that amp DOWN
					If primary amplifier is an
					EVX-25E, EVX-50E, or EVX-100E
					place dipswitch #5 on SN-1
	TS1				of that amp DOWN
	4	3	2	1
	LED
					Backup amp
	J1			+	EOLR at last EVX-BA
					Input from backup
				-	amplifier (TB-1 #5-6)
				+	Input from primary
	TB1			-	amplifier (TB-1 #5-6)

TB2

BA-100 Rev C

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